>> it was built here at jpl. we had lots of partners all over the world too, where the science missions have been donated by foreign countries. >> bill: did you do -- the launch -- or the landing, was so perfect. did you do any practice runs like -- i'm just curious, like in the desert or anything? >> there has been an extensive testing of everything on here instruments, landing. you name it we have tested it. i don't know if they did a full end-to-end testing. i would have to ask one of the landing engineers. >> bill: but certainly all of the instruments and cameras, was all tested. >> yes, we have continuing to test even today. we're doing extensive testing on the drilling and arm, and we'll continue to test all through the mission. >> bill: let me ask you what have we learned so far? >> we have learned that we have landed in a very exciting place. this mission is not -- unlike anything else we have ever flown. it's very, very complex. it has more instruments more things to do than anything we have put down on